基于位移反分析法的边坡失稳计算

Analysis of Slope Stability Based on Displacement Inversion Method

边坡失稳破坏通常会表现出明显的塑性区破坏以及位移变化,本文通过数值模拟分析的方法,先正向得到目标边坡稳定性状况,与实际监测的坡体位移数据进行匹配。其次基于建立的数值模型,通过给坡体施加位移载荷模拟边坡形变,使施加的位移值等于监测系统得到的位移数值,与正向计算结果进行对比,并通过调整位移载荷的大小,计算出各自的安全系数,得到位移变化与安全系数之间的关系。分析结果显示,边坡破坏与位移有明显的非线性关系,通过判断该非线性关系的临界点,可为实际边坡失稳破坏提供预警,也可为类似实际工程提供相应技术依据以及研究思路。

The slope instability and failure usually show plastic zone of failure with visible displacement changes.In this paper,the stability of target slopes was firstly obtained through numerical simulation.And the calculated displacements were to match with those from actual monitoring.Then,based on the established numerical model,apply displacement loads to the slope to simulate slope deformation and adjust the displacement loads so that the calculated displacement is equal to the monitored displacement.The respective safety factors were also calculated.Thus,the relationship between displacements and safety factors was obtained.The analysis results showed that there is a significant nonlinear relationship between slope failure and displacement.By evaluating the critical point of this nonlinear relationship,it can not only provide early warning for the actual slope stability failure,but also provide corresponding technical basis and research ideas for similar projects.